Baron Greystone
Explorer
As someone already posted, they're "reasonably common." I play 1st ed AD&D. Reading the rules gave us the idea. And it's nice for a player character to have some muscle of his own to protect him; other players are notoriously unreliable.
Has it ever come up in other games? Well, pets, NPC's, associates, robots and etc do get involved. But it's not usually as prevalent, again probably because it's not in the rules for those games.
Although I do get specific players who are always looking for some 'extensions' of their PC. I don't have a problem with it, and let them run the things unless I feel like stepping in and taking over now and again.
Has it ever come up in other games? Well, pets, NPC's, associates, robots and etc do get involved. But it's not usually as prevalent, again probably because it's not in the rules for those games.
Although I do get specific players who are always looking for some 'extensions' of their PC. I don't have a problem with it, and let them run the things unless I feel like stepping in and taking over now and again.